I cant land a cartwheel correctly! help?

I can get to the point where im up and in the handstand position with legs apart, but then right when your supposed to land, i somehow twist to get my legs together and (i don't fall on the ground or anything) and land it on the ground. Its really frustrating. Ive videotaped myself and i cant seem to find whats wrong!, thats causing me to land it so weirdly! Any help? Sorry it is a a bit confusing. I've watching ton of videos, and still cant break the 'habit; of landing it like that!